Rappel: les pluriels irréguliers...

Irregular plural forms

 Sometimes you do not just add the letter –S .
 This is a list of some irregular plural forms.

 Complete: 

 a) The vowel sounds change:
man→ men
 woman→ ---------------
 foot → feet
tooth→ ---------------
mouse → mice
louse→ -----------------
child → ----------------

 b) Some words do not change at all:

 sheep → sheep
 fish→ -------------
means→ ----------
species→-------------
 series→ --------------

 c) Words ending with –f→ - ves:
wife → wives
calf → --------------
leaf → ---------------
thief → ------------
life → -------------

 d) Words ending with –o →-oes:
 hero → heroes
 potato→-------------
tomato→ -----------

e) Some have a Latin plural form:
cactus→ cacti
 larva → larvae

 f) Words ending with –on → a
 phenomenon → phenomena

 g) Words ending with –is→ -es
crisis → crises
thesis→ theses